Procloeon furcalabrum, Kluge, 2025

Procloeon View in CoL View at ENA (subgen.?) furcalabrum sp. nov.

( Figs 190–203 View FIGURES 190–197 View FIGURES 198–203 )

Material examined. Holotype: female larva of penultimate instar, THAILAND, prov. Mae-Hong-Son, Pai , river Pai upstream Tan Jet Ton village, 5–11.II.2015, coll. N. Kluge & L. Sheyko.

Etymology. The species name furcalabrum refers to bifurcate shape of labrum due to its concave distal margin ( Fig. 190 View FIGURES 190–197 ); this character is common with Psammonella and Pseudocentroptilum , from which the new species differs by non-modified maxillae and labium.

Larva. CUTICULAR COLORATION. Legs mostly ochre, each femur with brown macula in distal part ( Fig. 203 View FIGURES 198–203 ). Abdominal terga mostly ochre with brown markings: tergum II with lateral and middle markings, terga III and V with lateral markings, tergum VI mostly brown ( Fig. 198 View FIGURES 198–203 ).

HYPODERMAL COLORATION. Abdominal terga with paired, transverse, reddish spots at segment joinings; tergum I with pair of roundish, reddish spots laterally ( Fig. 198 View FIGURES 198–203 ).

SHAPE AND SETATION. Labrum with distal margin concave ( Fig. 190 View FIGURES 190–197 ). Mandibles with incisor and kinetodontium separated up to base ( Figs 196–197 View FIGURES 190–197 ). Maxilla with all 3 canines long, slender and pointed, with 3 long and slender dentisetae; inner-ventral and inner-dorsal setal rows not curved, setae laterad of canines few and not forming transverse row ( Fig. 194 View FIGURES 190–197 ). Maxillary palp 3-segmented ( Fig. 193 View FIGURES 190–197 ). Glossae and paraglossae pointed, of subequal length; 3rd (terminal) segment of labial palp moderately widened distally ( Figs 191–192 View FIGURES 190–197 ).

Hind protoptera completely absent.

Femur, tibia and tarsus without stout setae on outer side; inner side of femur with few small, stout, pointed setae; inner side of tibia and tarsus with longer, pointed setae. Claws long and slender, with 2 rows of small, slender denticles on proximal 1/3 of claw length ( Fig. 202 View FIGURES 198–203 ).

Abdominal segments II–VII with pair of posterolateral denticles; segments VIII–IX with several denticles on lateral sides ( Fig. 200 View FIGURES 198–203 ). Posterior margin of abdominal tergum I without denticles; that of terga II–X with pointed denticles alternated with small denticles or blunt protuberances ( Figs 200–201 View FIGURES 198–203 ). Posterior margins of abdominal sterna I–V without denticles; that of sterna VI–IX with pointed denticles shorter than denticles on terga ( Fig. 199 View FIGURES 198–203 ). Paraprocts with pointed denticles of various sizes ( Fig. 199 View FIGURES 198–203 ).

Tergalii without dorsal lamella; at least tergalii I and III pointed ( Figs 204–206 View FIGURES 204–206 ).

Imago and subimago. Unknown.

Eggs. Unknown.

Dimension. Body length of penultimate instar larva 5.5 mm.

Comparison. The new species Procloeon furcalabrum sp. nov. is a single known species of Procloeon which have concave distal margin of labrum, and at the same time has no modifications of labium and maxillae peculiar for Pseudocentroptiloides and Psammonella.